Notice: 1. Keep the small personal air cooler blance, don't tilt it when working. 2. Add pure water or household tap water, to avoid affecting the cooling function. 3. Adding 3/4 Water in the Tank is the best, Do Not Full Filled. 4. Please run out of the water everytime, to prevent the water tank left some scale. 5. Use Cup brush or toothbrush clean the water tank once a week, keep clean and healthy.